On my trip to wales yesterday, she behaved really badly up the A34 where there was rain, any time we came to a hill she started misfiring like a good un. Worth noting that it was raining here.
I pulled over at Chievely and topped up the dashpot oil which was a little low and did my best (with a can of WD40

This seemed to help as she behaved a lot better up the M4 but it was also sunny and the roads where dry.
Then on the way back, as soon as we got on the A34 again (still wet) she started playing silly buggers when going up hills.
I have a bodged anti water device (plastic bag !) in front of the dizzy.
What I really want to know is whether one of those little electronic ignition modules that replaces the points and condensor will help stop this as it really gets on my proverbials !
Just to note, the coil condensor cap arm leads plugs & points are all relatively new and she only does this occasionally in the wet and when going up hill ! She has also been RR'd recently so the fuelling is accurate.
Thanks
James